Those cables are pretty common. You should be able to pick one up at any electronics store, Walmart, Radio Shack, Dollar Stores, even many hardware stores.
If all else fails you can even order one online and have it delivered to you. Here is a link to one available on EBay for only $1 US:
Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and item at the website indicated.
Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the link, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck and take care.